The invention discloses dust-free damping cutting equipment for building pipes. The equipment comprises a supporting base. The middle of the supporting base is rotationally connected with a horizontal rotary rod through bearings. The left end of the horizontal rotary rod is fixedly connected with a left thread. The right end of the horizontal rotary rod is fixedly connected with a right thread. The left thread and the right thread are opposite in spiral direction. The middles of the outer sides of the left thread and the right thread are in threaded connection with sliding sleeves correspondingly. The lower sides of the sliding sleeves are fixedly connected with first rotary hinges correspondingly. The lower sides of the first rotary hinges are fixedly connected with oblique connecting rods correspondingly. Compared with the prior art, the dust-free damping cutting equipment has the beneficial effects that the equipment is simple in structure and convenient to use and move, and has the two functions of damping and dedusting when being used for cutting the building pipes, accordingly noise generated during cutting by the equipment is lowered, dust generated during cutting by the equipment is also collected, and scattering of scrap iron in all directions is avoided, so that the equipment is cleaner and more sanitary in use and deserves to be popularized.